I assume you're using VL58STD: Could you please post the output from 'cat /usr/share/applications/k3b.desktop'? If there is no output or the file cannot be found then please copy the desktop file there. You can do this by issuing this command as root:cp /opt/kde/share/applications/kde/k3b.desktop /usr/share/applications/

Well Ramesh, you do have a k3b.desktop file in the proper location ( /usr/share/applications ) so appears as though the k3b.desktop file does not have "Categories" which match the xfce specification for desktop files.

You therefore need to edit (as root) usr/share/applications/k3b.desktop and find the line at the bottom starting "Categories" and add an appropriate menu heading as found in xfce (for example "Utilities" or "System" or "Multimedia" or whatever xfce menu category you want it to appear under).

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